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北京八达岭林场人工林净碳交换及其环境影响因子

唐祥1,陈文婧1,李春义1,查天山1,3,吴斌1,王小平2,3,贾昕1**   

  1. (1北京林业大学水土保持学院, 北京 100083; 2北京市林业碳汇工作办公室, 北京 100013; 3中关村绿色碳汇研究院, 北京 100083)
  • 出版日期:2013-11-18 发布日期:2013-11-18

Net carbon exchange and its environmental affecting factors in a forest plantation in Badaling, Beijing of China.

TANG Xiang1, CHEN Wen-jing1, LI Chun-yi1, ZHA Tian-shan1,3, WU Bin1, WANG Xiao-ping2,3, JIA Xin1   

  1. (1School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China; 2Beijing Forestry Carbon Administration (BFCA), Beijing 100013, China; 3Zhongguancun Institute of Green Carbon, Beijing 100083, China)
  • Online:2013-11-18 Published:2013-11-18

摘要:

2011年11月—2012年10月,采用涡度相关法对北京市八达岭林场4年生针阔混交人工林的碳交换特征进行了连续观测.结果表明: 观测期间,该森林生态系统在7、8月为碳汇,其余月份均为碳源,净碳释放量与吸收量分别在4月和7月达到最大.生态系统净生产力为(-256±21) g C·m-2·a-1,其中生态系统呼吸为(950±36) g C·m-2·a-1,总初级生产力为(694±17) g C·m-2·a-1.生态系统呼吸与10 cm深度土壤温度呈较好的指数关系,其温度敏感性系数(Q10)为2.2.在5—9月,白天生态系统净碳交换对光合有效辐射的响应符合直角双曲线方程,表观量子效率呈明显的季节变化(0.0219~0.0506 μmol CO2·μmol-1),生态系统最大光合速率和白天平均生态系统呼吸强度与光合有效辐射和温度的季节变化趋势相似.此外,7、8月饱和水汽压差与土壤含水量对白天生态系统净碳交换有显著的影响.

 

Abstract: By using eddy covariance technique, a year-round (November, 2011-October, 2012) continuous measurement of net ecosystem carbon dioxide exchange (NEE) was conducted in a 4year old mixed forest plantation in Badaling of Beijing. The forest plantation ecosystem was a net carbon sink in July and August, but a carbon source in the rest months. The monthly net carbon loss and uptake were the largest in April and July, respectively. The annual net ecosystem productivity was (-256±21) g C·m-2·a-1, in which, the ecosystem respiration was (950±36) g C·m-2·a-1, and the gross ecosystem productivity was (694±17) g C·m-2·a-1. The nighttime NEE increased exponentially with the soil temperature at 10 cm depth, with the estimated temperature sensitivity of ecosystem respiration (Q10) being 2.2. During the growth season (May-September), the daytime NEE increased with photosynthetically active radiation (PAR) as described by the Michaelis-Menten rectangular hyperbola. The ecosystem quantum yield varied seasonally, ranging from 0.0219 μmol CO2 ·μmol-1 in May to 0.0506 μmol CO2 ·μmol-1  in July. The maximum carbon assimilation rate and the average daytime respiration followed the seasonal trends of PAR and air temperature. In July and August, vapor pressure deficit and soil moisture played a significant role in determining daytime NEE.